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OCR (non mei) M2 Wednesday 18th May 2016

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"And in other news, an OCR exam writer was found dead. The investigation has been called off as the list of disgruntled students and suspects is far, far too long"
Holy F***in' sh*t what the hell was that?! I already get extra time as it is, and I still managed to run out!!
Jesus f*cking christ... Whoever came up with that paper is a f*cking sadist...

Reply 101

Muzzles

Original post by xsanda

Updated solutions, with the collisions correct:

Xsanda’s solutions:

1) Car on a plane:
i) v = 22.5 m/s
ii) P = 35.9 kW

2) Particle up a plane:
i) Wd = 8.43 J
ii) v = 10.8 m/s

3 Arch shape:
i) show that: 13a/3π
ii) T = 8.82 N
iii) θ = 10.9º left of upwards vertical

4 Particle around a cone:
i) show that m/6 (2 sqrt3 g - 3 a ω²)
ii) T = 39.6N, V =1.19 m/s

5 Ladder:
i) show that 5W/24 (1+6x/a)
ii) max x = 1.7a
iii) tan = 39/14

6 collisions horizontally:
i) a: 5.5 m/s, b: 8 m/s, both in opposite direction to their original motion
ii) e=3/4

7 projectiles:
i) 18.8m high, 61.1 m AB
ii) 87.3 Ns
iii) 11.9 m

I agree with most of this accept Q5 iii) which I think should be tan(a)=12/5 and Q6 ii) is not exactly e=3/4 as this is calculated from the rounded values in the previous part, however I doubt anyone can remember the actual value. Good work overall though, props to you for remembering all of this.

Reply 102

marioman

Original post by Muzzles

Q6 ii) is not exactly e=3/4 as this is calculated from the rounded values in the previous part, however I doubt anyone can remember the actual value.

5.5 and 8 were the exact values.

Reply 103

Abscissa

Can anybody remember the quadratic equation in 6i?

Reply 104

TheNicholas

Original post by Abscissa

Can anybody remember the quadratic equation in 6i?

I think it's on page 5 :smile:

Reply 105

Muzzles

Original post by marioman

5.5 and 8 were the exact values.

Sorry my bad, I've just done the question again and got those values. I used my calculator to solve the quadratic in the exam to save time, must have given me an error, that's the last time I do that, at least I'll get method marks *sigh*

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(edited 7 years ago)

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Reply 106

jenmturner

That was an awful exam! Can anyone remember what the values for question 1 were and what marks each question was for?

Reply 107

TheNicholas

Original post by jenmturner

That was an awful exam! Can anyone remember what the values for question 1 were and what marks each question was for?

Do you want the answers to Q1? Or the question

Reply 108

jenmturner

Original post by TheNicholas

Do you want the answers to Q1? Or the question

just the question .. so the values for question 1 .. i think the resistance force was 600N and then it was climbing a slope of some sort.

Reply 109

Abscissa

For 6i, how many marks would I lose for choosing the wrong pair of solutions from the quadratic... And would I get ECF for using these values for ii?
Infact, wouldn't you get the same answer in ii regardless of which pair of solutions you chose?

(edited 7 years ago)

Reply 110

marioman

Original post by Abscissa

For 6i, how many marks would I lose for choosing the wrong pair of solutions from the quadratic... And would I get ECF for using these values for ii?

Probably 2. If you wrote down the correct solutions as well then maybe only 1. I suspect that full credit will be allowed in (ii) using the calculated values in (i) but one can't be sure until we see the mark scheme.

Reply 111

Abscissa

Original post by marioman

I ran out of space so decided to not write down both pairs, and just wrote down the one I thought was correct (which was evidentally not), bloody classic! Oh well!

Reply 112

username2002283

Anyone remember how many marks each question was worth? Would help a lot, thanks!

Reply 113

GM16

Anyone got the working for the last question?

Posted from TSR Mobile

Reply 114

Miracle-

I think you may have got 5 (iii) wrong because the equation you use to find R from part (ii) depends on a difference angle.

Reply 115

TheNicholas

Original post by Miracle-

I think you may have got 5 (iii) wrong because the equation you use to find R from part (ii) depends on a difference angle.

How do you mean?

Reply 116

pri12321

What the hell happened XD
Normally get like 65+ and can do it in about an hour but I didn't even finish this one and it was so bad omg.

Reply 117

Miningstew

Original post by 98Lauren98

Anyone remember how many marks each question was worth? Would help a lot, thanks!

Using Xsanda’s solutions as a template:

1) Car on a plane:
i) v = 22.5 m/s [3]
ii) P = 35.9 kW [3]

2) Particle up a plane:
i) Wd = 8.43 J [3]
ii) v = 10.8 m/s [4]

3 Arch shape:
i) show that: 13a/3π [5]
ii) T = 8.82 N [3]
iii) θ = 10.9º left of upwards vertical [4] (or 79.1º above the horizontal to the left)

4 Particle around a cone:
i) show that m/6 (2√3 g - 3aω²) [6]
ii) T = 39.6N, V =1.19 m/s [3]

5 Ladder:
i) show that 5W/24 (1+6x/a) [5]
ii) max x = 1.7a [3]
iii) tan = 39/14 [3]

6 collisions horizontally:
i) a: 5.5 m/s, b: 8 m/s, both in opposite direction to their original motion [8]
ii) e=3/4 [2]

7 projectiles:
i) 18.8m high, 61.1 m AB [4]
ii) 87.3 Ns [4]
iii) 11.9 m [9]

(edited 7 years ago)

Reply 118

bred123